Frequency Generator

[pskyboy]

Hey guys

I want to create a simple program to generate a sound frequency to play through my speakers. I would ideally like to be able to be able to generate a different frequency in each speaker ie 3Khz in right speaker and 3Khz in left speaker. So my question is what is teh easiest and fastest way of doign this.

Peter

[parksie]

3khz and 3khz are the same, just thought I'd mention that ;)

First, you need to decide what waveform you're going to use - you can have sine (i.e. use sin() to calculate the amplitude), square (jump between the maximum and minimum values after waiting a certain period, for example 10ms, at each value.

Then there's sawtooth where you cycle from minimum to maximum then drop, and triangle which is linear up/down (like sine, but sharp at each end and always straight lines).

Right, that's the waveforms out of the way...

If you look up the wave* functions in MSDN you'll find how to create and play a sound buffer. From there it's a simple matter of generating the contents (note, once you've created the waveform buffer it's easy because you just keep cycling the same buffer :D).

[pskyboy]

Cheers

I ment 3Khz and 5khz, something dirrerent to each speaker basically is this possible in teh same way.

Peter

[parksie]

Yes. You just need to calculate different values for each channel, but it's still the same functions to play it.